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20-05-2020
Mathematics

contestada

if q is inversely proportional to r squared and q=30 when r=3, find r when q=1.2

Respuesta :

22-05-2020

Answer:

r = 3

Step-by-step explanation:

q = k / [tex]r^{2}[/tex]

k = q[tex]r^{2}[/tex] = 1.2 x 3 x 3 = 10.8

q = 10.8/[tex]r^{2}[/tex]

1.2 = 10.8/[tex]r^{2}[/tex]

r = [tex]\sqrt{10.8 /1.2}[/tex] = 3

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